It is cells.
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The cell is the smallest living thing and an atom is the smallest non-living thing.
cell
The atom is the smallest unit containing a nucleus. However, this is not considered living. The smallest living thing in the world (besides viruses) are a parasitic Bacterium called Mycoplasma Gallicepticum.
The smallest unit of ecological organization is an individual organism. This could be a single plant or animal that interacts with its living and non-living environment within a specific ecosystem.
The cell is the smallest structural and functional unit of the body that is considered living. Cells are the basic building blocks of life and carry out essential processes necessary for an organism to survive.